- Heat pumps can operate in air temperatures from 50°F to 113°F- Requires fresh air supply for proper operation- Removable, washable air filters for easy maintenance- Thermostatically protected compressor includes high and low pressure warnings- Moves easily on swivel casters- Louver grille front air discharge and 12" diameter top air discharge- Optional Top Air Duct 8'L ducting and a 2' x 2' ceiling flange for air exhausting